grow an avocado tree from pit~ fun science experiment, but according to the article the tree probably won't produce fruit (or at least not for several years) so don't do this in hopes of advocado's anytime soon. :) Still fun for kids though!
10 Vegetables Herbs You Can Eat Once and Regrow Forever « Food Hacks - Vegetables you can replant and grow at home after buying at the grocery store - plants that keep growing that you can eat - edible landscaping and homegrown gardening food ideas
The latest craze in the green gardening market is the self-watering barrel garden. Barrel gardens are easy to make and efficient to use. A drum can hold up to 72 plants, allowing for more food to be harvested at a one time